This shapefile layer serves as an index map for individual sheets in the Global Navigation and Planning Chart (GNC), 1:5,000,000 scale, which projects to Lambert Conformal Conic. The National Geospatial-Intelligence Agency and its legacy organizations (Defense Mapping Agency, National Imagery and Mapping Agency) originally published the series, and all sheets are in English. East View Geospatial has completed digitization, georeferencing, and electronic archiving services.